AWS RDS database instances does not have backup retention enabled. This may impact the availability of data and affect disaster recovery plan.
In AWS Console -
In Terraform -
References:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_CommonTasks.BackupRestore.html
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/rds_cluster#backup_retention_period